smeezekitty wrote:Anything new happening?
Sorry i got side tracked with the computer system's converter .this took me to being also interested in looking into this side of creating a higher line rate signal with a PC ...i didn't post it up but after working out the lap top was a bit less than what is needed ,i looked into getting a old desk top to work this out as i know the graphics card that will do the line and frame rates via modeline program.
Out of chance i found at the local tip reuse shop a pentium 4 with a vga and composite video card it will out put 625 line so in a way it is a systems converter for either sstv or NBTV to 625 line not some thing i was thinking about at the time but do it it can .I still want the correct graphics card but this is a cheapy start ok for 10 dollar PC.
Now as far this project some times i stop and have think about the different options or ideas and make so if it doesn't work out i have not stuffed the original idea up .
I was also waiting for the ltc1799 to turn up which it just did on Friday and had my first go at soldering a micro ic ..it seems to have worked checking with a conductivity test to the larger socket all looks good there no solder bridging .
Main problems i found were holding the ic in place to solder in the first place i used some thin copper wire to hold it in place then i could solder which really was very touchy but doable .
I will hook up the circuit tomorrow and see if it works . I plan to hook the output of the 1799 ic oscillator up to Steve Anderson's DAC circuit ic201 4040 pin 10 leave the frame rate as is via the crystal oscillator circuit i can then on the line rate side just switch in either the tuneable ltc1799 or the crystals 4040 frequency dividing outputs as in the schematic ...well that's the plan .
In this way i am not stuffing up what works just adding on an idea and see how well or bad it works and can be removed with out a problem ,if it works out it means i can change the line rate to what i want to any vintage standard .
I have also been thinking of the original circuit which is still handy when used with the PMT camera which both use the same circuits here again thanks to Steve ...
if i just use either one of their 3.2mhz crystal oscillators and just use the one clock to feed both monitor and PMT camera they will both be in line and frame lock flip of a switch ..
I fired the monitor up yesterday still works good sign ! and did a little work on feeding some signal outputs to the back plugs.
If the ltc1799 works out i have Precision Potentiometer to work with it .
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.